With helmets never unless your tired of it or it takes a serious hit. You can buy replacement liners for them. Coats, if they get too small or wear out and start falling apart. I'm not rich enough to be buying 2 or 3 coats to have at once. I took my time and spent $150 on a his-vis armored jacket and expect it to last for a looong time. Helmets I do have 2 though, 3/4 and a full face. I like having a choice of which to wear. Only thing I want now is a set of good riding gloves. Pair I have now are like mechanics gloves and don't offer enough knuckle protection. I wear high ankle hiking boots for the feets. For me that's as good as it gets for now.